#game {
  position: relative;
  width: 100%;
  height: 600px;
  background-image: url('../images/sky.png');
}

.bird {
  position: absolute;
  top: 235px;
  left: 50%;
  margin-left: -15px;
  width: 30px;
  height: 30px;
  background-image: url('../images/birds.png');
  transition: top .3s linear;
}

.start {
  position: absolute;
  top: 295px;
  left: 50%;
  margin-left: -100px;
  width: 200px;
  height: 60px;
  line-height: 60px;
  text-align: center;
  font-weight: bolder;
  transition: all .3s linear;
  cursor: pointer;
}

.start.start-white {
  color: #fff;
  font-size: 24px;
}

.start.start-blue {
  color: #09f;
  font-size: 36px;
}

.score {
  position: absolute;
  left: 50%;
  /* margin-left: ; */
  transform: translateX(-50%);
  font-size: 24px;
  color: #fff;
  font-weight: bolder;
  display: none;

}

.mask {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #000;
  opacity: .7;
  display: none;
  z-index: 2;
}

.end {
  position: absolute;
  top: 70px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  display: none;
  z-index: 3;
  /* color: red; */
}

.end .over {
  font-size: 35px;
  font-weight: bolder;
  color: red;
}

.end .result,
.end .final-score {
  margin-top: 20px;
  color: #ff0;
  font-size: 20px;
  font-weight: bold;
}

.end .rank-list {
  margin-top: 20px;
  color: #09f;
  text-align: left;
}

.end .rank-item {
  height: 30px;
  line-height: 30px;
  margin-bottom: 10px;
  padding: 0 10px;
  font-size: 13px;
}

.end .rank-degree {
  display: inline-block;
  width: 14px;
  height: 14px;
  line-height: 14px;
  margin-right: 10px;
  text-align: center;
  color: #fff;
  background-color: #8eb9f5;
  font-size: 12px;
}

.end .rank-degree.first {
  background-color: #f54545;
}

.end .rank-degree.second {
  background-color: #ff8547;
}

.end .rank-degree.third {
  background-color: #ffac38;
}

.end .rank-score {
  display: inline-block;
  width: 30px;
}

.end .restart {
  color: #09f;
  font-size: 18px;
  font-weight: bolder;
  cursor: pointer;
}

.pipe {
  position: absolute;
  /* left: 300px; */
  width: 52px;
  height: 150px;
  z-index: 1;
}

.pipe.pipe-up {
  top: 0;
  background-image: url('../images/pipe2.png');
  background-position-y: bottom;
}

.pipe.pipe-bottom {
  bottom: 0;
  background-image: url('../images/pipe1.png');
}